 ZD and Ubuntu
I don't know about the Windows version as I have it running on Win7 32 and 64 bit home premium versions without an issue. However - running it on my Ubuntu machine was another story.
In my case I learned that there appears to be an issue in one of the start up scripts where it is looking for Java. My shell scripting knowledge isn't the best so I was unable to figure out exactly what it was trying to do.
Basically it's looking for Java and errors regardless of whether or not it finds it.
Also, I have two versions of Java installed - openJDK and Sun-Java. I use the update-alternatives utility to point to the java I want to use.
As a result /usr/bin/java is defined as follows:
/usr/bin/java -> /etc/alternatives/java*
/etc/alternatives/java -> /usr/lib/jvm/java-6-sun/jre/bin/java*
I don't know if this setup caused the problem or not but at first no matter what I tried ZD would not start.
The fix is very simple: add the following two lines to /etc/environment
JAVA_HOME=/usr/lib/jvm/java-6-sun
JAVACMD=java
I used: sudo gedit /etc/environment to edit the file. I rebooted after making the change.
Of course you'll need to set JAVA_HOME to where your java is located.
The definition of those two variables causes the code I was talking about above to skip the java check and continue on properly.
Credit for this solution must also go to the nameless others across the net that posted on this issue. I did not come up with it entirely on my own.  | 
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